Electric motor

ABSTRACT

An electric motor includes a cylindrical rotor with a plurality of wires parallel to the cylindrical axis nested between two cylinders of magnets in a stator. The cylinders of magnets may be a solid magnet, a plurality of bar magnets, a plurality of coils generating magnetic fields or other magnets or generated magnetic fields. A nested electric motor includes a first electric motor additionally including a first shaft, which first electric motor nests within the hollow center of a second larger electric motor additionally including a second shaft. The first shaft is coaxial with the second shaft.

RELATED APPLICATION

This application is a continuation of application Ser. No. 16/554,571filed Aug. 28, 2019, which is incorporated herein by reference in itsentirety.

FIELD OF THE INVENTION

The present invention relates to electric motors and more particularlyto an electric motor comprising a cylindrical rotor with a plurality ofwires parallel to the cylindrical axis nested between two cylinders ofmagnets in a stator and also to electric motors nested one within theother with coaxial shafts.

BACKGROUND OF THE INVENTION

Electric motors convert electrical energy into mechanical energy andtypically comprise a stator and a rotor. The stator is the stationarypart of the motor's electromagnetic circuit and usually consists ofeither magnets or windings. The rotor is the moving part of the motorwhich rotates due to the interaction between the windings and magneticfields which produces a torque around the rotor's axis. In an A.C.motor, a commutator applies electric current to the windings which leadsto the production of a steady rotating force. Electric motors can beused in a variety of applications, including, but not limited to,electric cars, aviation, robotics, and as a stand-alone motor. Electricmotors may also be used to convert mechanical energy into electricalenergy and when used for this purpose they are referred to as electricgenerators.

In U.S. Pat. No. 7,719,159 issued May 18, 2010, a series of housingstructures each supporting field pole members and configured to matewith one another form an enclosure of an electrodynamic machine. Eachfield pole member may have a first pole face and a second pole face.Also, the members each can have a field pole core being configured toproduce a flux path in a direction from the first pole face to thesecond pole face.

In U.S. Pat. No. 8,710,779 issued Apr. 29, 2014, an electric motor isdescribed having at least two stators disposed coaxially to each otherand a rotor, wherein each stator has 2*n poles with n=1, 2, 3, . . . ,each stator has at least one common coil or winding for all poles, eachstator has a first and second partial shell, each partial shell has ashell bottom and n poles, each pole is formed as a tooth extending inaxial direction or substantially in axial direction and beginning on theshell bottom, wherein when assembled partial shells of a stator thetooth or the teeth of the first partial shell is or are disposed inalternating manner in circumferential direction with the tooth or theteeth of the second partial shell, and wherein with assembled partialshells or a stator, the at least one coil) or winding is receivedbetween the partial shells.

U.S. Pat. No. 8,247,944 issued Aug. 21, 2012, describes brushed DCelectric motors using a plurality of brushes for energizing the windingsin the rotor of the motor. The method described is to reduce torqueripple in brushed DC electric motors by positioning each brush in apocket with inter alia a spring and a damper.

U.S. Pat. No. 5,500,994 issued Mar. 26, 1996, discloses a method ofmanufacturing a rotor to address the demand for a miniature electricmotor with high torque power, and power saving. The method ofmanufacture aims to reduce cost of materials, the weight, and theseparation or cracks of the magnetic layer of the rotor. Other electricmotors have reduced weight through changing the type of material used inthe motor.

It is desirable to have a lightweight brushed DC electric motor thatsaves space while also offering high performance with a smooth torquecurve.

SUMMARY OF THE INVENTION

The present invention is an electric motor comprising a cylindricalrotor with a plurality of wires parallel to the cylindrical axis nestedbetween two cylinders of magnets in a stator.

The two cylinders of magnets may be a solid magnet, a plurality of barmagnets or a plurality of coils generating magnetic fields or othermagnets or generated magnetic fields.

A nested electric motor comprises a first electric motor additionallycomprising a first shaft, which first electric motor nests within thehollow centre of a second larger electric motor additionally comprisinga second shaft and wherein the first shaft is coaxial with the secondshaft.

A nested electric motor comprising a first electric motor with a firstshaft, which first electric motor nests within the hollow centre of asecond larger electric motor with a second shaft and wherein the firstshaft is coaxial with the second shaft, and wherein the second electricmotor comprises a cylindrical rotor with a plurality of wires parallelto the cylindrical axis nested between two cylinders of magnets in astator.

BRIEF DESCRIPTION OF THE FIGURES

These and other aspects of the present invention will be apparent fromthe brief description of the drawings and the following detaileddescription in which:

FIG. 1 is an exploded perspective horizontal cross-sectional view of anembodiment of an electric motor of the present invention withcylindrical magnets.

FIG. 2 is a perspective horizontal cross-sectional view of an embodimentof the present invention with cylindrical magnets.

FIG. 3 is a cut away perspective horizontal cross-sectional view of anembodiment of the present invention with cylindrical magnets.

FIG. 4 is a side cross-sectional view of an embodiment of the presentinvention with cylindrical magnets.

FIG. 5 is a vertical cross-sectional view of an embodiment of thepresent invention with cylindrical magnets.

FIG. 6 is an exploded perspective horizontal cross-sectional view of anembodiment of an electric motor of the present invention with barmagnets.

FIG. 7 is a cut away perspective horizontal cross-sectional view of anembodiment of the present invention with bar magnets.

FIG. 8 is an exploded perspective horizontal cross-sectional view of anembodiment of an electric motor of the present invention with coilsgenerating magnetic fields.

FIG. 9 is a cut away perspective horizontal cross-sectional view of anembodiment of the present invention with coils generating magneticfields.

FIG. 10 is a side cross-sectional view of an embodiment of the rotorwith shaft of the present invention.

FIG. 11 is a vertical cross-sectional view of an embodiment of the rotorof the present invention.

FIG. 12 is a back perspective view of an embodiment of an electric motorof the present invention.

FIG. 13 is a front perspective view of an embodiment of an electricmotor of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention is an electric motor comprising a cylindricalrotor with a plurality of wires parallel to the cylindrical axis nestedbetween two cylinders of magnets (either a solid magnet or plurality ofmagnets). In a further embodiment of the present invention an electricmotor of the present invention is nested in the centre of a largerelectric motor of the present invention and the respective shafts 90 arecoaxial. In a further embodiment of the present invention an electricmotor of any type is nested in the centre of a larger electric motor ofthe present invention and the respective shafts 90 are coaxial.

FIGS. 1-5 show an embodiment of the electric motor of the presentinvention with a solid cylindrical magnet. FIGS. 6 and 7 show anembodiment of the electric motor of the present invention with aplurality of bar magnets in a cylinder shape and FIGS. 8 and 9 show anembodiment of the electric motor of the present invention with aplurality of coils generating magnetic fields in a cylinder shape. FIGS.10 and 11 show a rotor of the present invention.

The stator comprises a stator body 10 comprising a double walled ringhaving an outer circular wall 12 and an inner circular wall 14 with anopen first end and a closed second end. The stator body 10 houses anouter circular coil magnet 30 adjacent the outer circular wall and aninner circular coil magnet 35 adjacent to the inner circular wall 14.The inner magnet 35 is substantially concentric with the outer magnet30. The magnets may be fixed in any way as in existing electric motors,for example the coils could each have a strip and two screws.

The rotor comprises a ring-shaped rotor body 20 and rotor wiring. Therotor body 20 has a first end and second end between which are aplurality of parallel linear protrusions 45 forming wiring slots 47 inbetween. The rotor wiring comprises a plurality of parallel linear wires40 having an upper inner ring 60 affixing the first end of the wires 40and a lower inner ring 65 affixing the second end of the wires 40. Theupper inner ring 60 is connected to an upper outer ring 50 by a ringwire 80 and the lower inner ring 65 is connected to a lower outer ring55 by a ring wire 80. Each individual wire of the wires 40 fit in one ofthe wiring slots 47 and the rotor body nests within the upper outer ring50 and upper inner ring 60 at a first end of the rotor body and betweena lower outer ring 55 and a lower inner ring 65 at a second end of therotor body. The rotor nests in between the outer magnet 30 and innermagnet 35. An open cylindrical shaft 90 is at the end of the rotor body20. The shaft 90 can be attached as with existing electric motors, forexample by welding.

The upper outer ring 50 and lower outer ring 55 each have a brushchannel 75. Brushes 70 extend through the brush channels 75 and areconnected to the ring wires 80 and the brushes 70 are connected to DCpower source terminals (not shown), providing electrical feed.

In a further embodiment of the invention, an electric motor (either ofthe present invention or another electric motor) is nested within thehollow centre of a larger electric motor of the present invention andthe two electric motors' respective shafts 90 are coaxial.

A nested electric motor with two motors of the current inventioncomprises a first electric motor with a first shaft 90, which firstelectric motor nests within the hollow centre of a second largerelectric motor with a second shaft 90, wherein the first shaft 90 iscoaxial with the second shaft 90.

In an embodiment of the nested electric motor 5 of the presentinvention, the motor is made from plastic and iron and any ferritematerial, although it is understood that the motor may be made from anymaterials known in the art or suitable for an electric motor.

The electric motor of the present invention may be used in electriccars, aviation, robotics, stand alone and other applications.

While embodiments of the invention have been described in the detaileddescription, the scope of the claims should not be limited by thepreferred embodiments set forth in the examples but should be given thebroadest interpretation consistent with the description as a whole.

1-4. (canceled)
 5. A cylindrical electric motor with a hollow center,said electric motor comprising: a cylindrical stator body; a cylindricalrotor; a plurality of parallel wires running parallel to the cylindricalaxis of the electric motor; an outer magnet; and an inner magnet;wherein the cylindrical stator body is a double walled tube having anouter cylindrical wall and an inner cylindrical wall with an open endand a closed end; and wherein the outer magnet, the cylindrical rotor,the plurality of parallel wires and the inner magnet rest cylindricallyin order between the outer cylindrical wall and the inner cylindricalwall.
 6. The electric motor of claim 5 in which the inner magnet and theouter magnet are selected from a group consisting of a solid magnet, aplurality of bar magnets and a plurality of coils generating magneticfields.
 7. The electric motor of claim 5, further comprising a shaftattached to the cylindrical rotor at the open end of the cylindricalstator body.
 8. The electric motor of claim 5, wherein the cylindricalrotor comprises a plurality of parallel protrusions forming slotstherebetween and the plurality of parallel wires are in the slotsbetween the plurality of parallel protrusions.
 9. The electric motor ofclaim 8, wherein the plurality of parallel wires has a first end at theopen end of the cylindrical stator body and a second end at the closedend of the cylindrical stator body, and the first end of the pluralityof parallel wires is affixed to an upper inner ring and the second endof the plurality of parallel wires is affixed to a lower inner ring.